Nobody is going to go into the convention with enough pledged delegates to take the nomination without superdelegates. Obama would need more than three-quarters of the remaining pledged delegates, while it is mathematically impossible for Clinton to do so. In the proportional representation system used by Democrats, and in light of the remaining primary calendar, this simply isn't going to happen.

It is also exceedingly likely that Obama will have the most pledged delegates going into the Democratic National Convention in Denver in August, although it isn't clear how much of an edge will remain when all of the primaries and caucuses are over.

The recent trend in superdelegate endorsements has overwhelmingly favored Obama. It isn't yet clear if the Pennsylvania primary results will change that trend.

Michigan and Florida are not currently on track to have any delegates seated, although it isn't too late for some kind of deal to be struck regarding those states.

The odds at this point weigh heavily against Clinton. She needs about 60% of the remaining delegates (super and pledged) without Michigan and Florida. She didn't do that well in Pennsylvania, and the remaining states on the primary calendar are a mixed bag, so she is unlikely to do that well among the remaining pledged delegates. This means that she needs well over 60% of the remaining superdelegates' support to win.